/*
Copyright (C) 2006 Pedro Felzenszwalb

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
*/

/* random stuff */

#pragma once

#include <cmath>

namespace distance_transform
{
    typedef unsigned char uchar;

    typedef struct
    {
        uchar r, g, b;
    } rgb;

    inline bool operator==(const rgb& a, const rgb& b)
    {
        return (a.r == b.r) && (a.g == b.g) && (a.b == b.b);
    }

    template <class T>
    inline T abs(const T& x) { return x > 0 ? x : -x; }

    template <class T>
    inline int sign(const T& x) { return x >= 0 ? 1 : -1; }

    template <class T>
    inline T square(const T& x) { return x * x; }

    template <class T>
    inline T bound(const T& x, const T& min, const T& max)
    {
        return x < min ? min : (x > max ? max : x);
    }

    template <class T>
    inline bool check_bound(const T& x, const T& min, const T& max)
    {
        return (x < min) || (x > max);
    }

    inline int vlib_round(float x) { return static_cast<int>(x + 0.5F); }

    inline int vlib_round(double x) { return static_cast<int>(x + 0.5); }

    inline double gaussian(double val, double sigma)
    {
        return exp(-square(val / sigma) / 2) / (sqrt(2 * M_PI) * sigma);
    }
} // namespace distance_transform
